The GD-PI is a crucial part of the admission process. One cannot perform well unless they have prepared for the same. My answer comprises some benefits and tips that will help you sail smoothly.

Group Discussion 

For the GD one needs to prepare General Awareness. Candidates are expected to be well informed about General Affairs and should have their own logical opinions on the same. This can be done by reading popular magazines and newspapers to keep yourself aware of major issues related to your city, state, country, and the world. You might be asked to write about abstract topics too. The best way is to practice GD with a group of students 

Personal Interview 

The interview aims to analyze your personality, which is the main aspect of a manager. Some tips to ace your interview are

• Prepare well for your academic subjects of graduation, since your grasp on those subjects is taken as a parameter to determine your student capabilities.
• Prepare 2-3 subjects from the core areas of your study to prepare in depth because sometimes the interviewers ask questions from the basics of your subject or from the application of the same. 
• You should also prepare your projects and internships
• Channelising your interests helps them in understanding how passionate you are
• Give at least 2-3 mock interviews to an experienced and senior panel of people who can assess your preparation and provide feedback on the same.
• After each mock interview, evaluate yourself and see where you lack and how you can improve. 
• Search for YouTube videos or join a coaching institute as they offer excellent Counseling and help in GD PI and choosing the best B-School.

Preparation for a Personal Interview should start in advance as it requires a lot of time and effort.